Scholars have long insisted that the Amazonian ecosystem placed severe limits on the size and complexity of its ancient cultures, but leading researcher Denise Schaan reverses that view, revealing a major civilization in ancient Amazonia that was more complex than anyone previously dreamed.

Scholars have long insisted that the Amazonian ecosystem placed severe limits on the size and complexity of its ancient cultures, but leading researcher Denise Schaan reverses that view, revealing a major civilization in ancient Amazonia that was more complex than anyone previously dreamed.